Fixed the PLAYER_TELEPORT event so event.getTo().getWorld() is correct. (#451)

src/main/java/net/minecraft/server/NetServerHandler.java

@@ -258,30 +258,47 @@ public class NetServerHandler extends NetHandler implements ICommandListener {
         }
     }
 
-    public void a(double d0, double d1, double d2, float f, float f1) {
-        // CraftBukkit start
+    // CraftBukkit start -- Delegate for a(double, double, double, float, float)
+    public boolean teleport(Location dest) {
+        // Note: the world in location is used only for the event
+        // Inter-world teleportation is handled in CraftPlayer.teleport()
+
         Player player = getPlayer();
         Location from = player.getLocation();
-        Location to = new Location(player.getWorld(), d0, d1, d2, f, f1);
+        Location to = dest.clone();
         PlayerMoveEvent event = new PlayerMoveEvent(Type.PLAYER_TELEPORT, player, from, to);
         server.getPluginManager().callEvent(event);
 
         from = event.getFrom();
         to = event.isCancelled() ? from : event.getTo();
 
+        double d0, d1, d2;
+        float f, f1;
+
         d0 = to.getX();
         d1 = to.getY();
         d2 = to.getZ();
         f = to.getYaw();
         f1 = to.getPitch();
-        // CraftBukkit end
 
+        // net.minecraft.server start
         this.l = false;
         this.i = d0;
         this.j = d1;
         this.k = d2;
         this.e.b(d0, d1, d2, f, f1);
         this.e.a.b((Packet) (new Packet13PlayerLookMove(d0, d1 + 1.6200000047683716D, d1, d2, f, f1, false)));
+        // net.minecraft.server end
+
+        // Returns TRUE if the teleport was successful
+        return !event.isCancelled();
+    }
+    // CraftBukkit end
+
+    public void a(double d0, double d1, double d2, float f, float f1) {
+        // CraftBukkit start -- Delegate to teleport(Location)
+        teleport(new Location(getPlayer().getWorld(), d0, d1, d2, f, f1));
+        // CraftBukkit end
     }
 
     public void a(Packet14BlockDig packet14blockdig) {

src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java

@@ -107,13 +107,23 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         return ((WorldServer)entity.world).getWorld();
     }
 
-    public void teleportTo(Location location) {
+    public boolean teleport(Location location) {
         entity.world = ((CraftWorld)location.getWorld()).getHandle();
         entity.b(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
+        // entity.b() throws no event, and so cannot be cancelled
+        return true;
+    }
+
+    public boolean teleport(org.bukkit.entity.Entity destination) {
+        return teleport(destination.getLocation());
+    }
+
+    public void teleportTo(Location location) {
+        teleport(location);
     }
 
     public void teleportTo(org.bukkit.entity.Entity destination) {
-        teleportTo(destination.getLocation());
+        teleport(destination);
     }
 
     public int getEntityId() {

src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -137,18 +137,14 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
     }
 
     @Override
-    public void teleportTo(Location location) {
+    public boolean teleport(Location location) {
         WorldServer oldWorld = ((CraftWorld)getWorld()).getHandle();
         WorldServer newWorld = ((CraftWorld)location.getWorld()).getHandle();
         ServerConfigurationManager manager = server.getHandle();
         EntityPlayer entity = getHandle();
+        boolean teleportSuccess;
 
         if (oldWorld != newWorld) {
-            manager.c.k.a(entity);
-            manager.c.k.b(entity);
-            oldWorld.manager.b(entity);
-            manager.b.remove(entity);
-            oldWorld.e(entity);
 
             EntityPlayer newEntity = new EntityPlayer(manager.c, newWorld, entity.name, new ItemInWorldManager(newWorld));
 
@@ -160,17 +156,31 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
             newEntity.inventory.e = newEntity;
             newEntity.activeContainer = entity.activeContainer;
             newEntity.defaultContainer = entity.defaultContainer;
+            newEntity.locX = location.getX();
+            newEntity.locY = location.getY();
+            newEntity.locZ = location.getZ();
             newWorld.u.d((int) location.getBlockX() >> 4, (int) location.getBlockZ() >> 4);
 
-            newEntity.a.a(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
+            teleportSuccess = newEntity.a.teleport(location);
+
+            if (teleportSuccess) {
+                manager.c.k.a(entity);
+                manager.c.k.b(entity);
+                oldWorld.manager.b(entity);
+                manager.b.remove(entity);
+                oldWorld.e(entity);
+
                 newWorld.manager.a(newEntity);
                 newWorld.a(newEntity);
                 manager.b.add(newEntity);
 
                 entity.a.e = newEntity;
                 this.entity = newEntity;
+            }
+
+            return teleportSuccess;
         } else {
-            entity.a.a(location.getX(), location.getY(), location.getZ(), location.getYaw(), location.getPitch());
+            return entity.a.teleport(location);
         }
     }